Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.003 Å; R factor = 0.023; wR factor = 0.057; data-to-parameter ratio = 15.8.In the polymeric title compound, [Ba(C 7 H 3 NO 4 )(H 2 O) 3 ] n , the Ba II ion is ten-coordinated in an NO 9 environment by one N atom and three O atoms from three pyridine-2,4-dicarboxylate (pydc) ligands and six water molecules. The 3 -pydc ligands and the bridging water molecules connect the Ba atoms into a layer parallel to (100). The crystal packing is stabilized by O-HÁ Á ÁO and C-HÁ Á ÁO hydrogen bonds.
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